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Allophonic rule

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Title: Allophonic rule  
Author: World Heritage Encyclopedia
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Subject: Allophone
Publisher: World Heritage Encyclopedia

Allophonic rule

An allophonic rule is a phonological rule that indicates which allophone realizes a phoneme in a given phonemic environment. In other words, an allophonic rule is a rule that converts the phonemes in a phonemic transcription into the allophones of the corresponding phonetic transcription. Every language has a set of allophonic rules.

In American English, the voiceless alveolar stop phoneme /t/ is realized as the alveolar flap allophone [ɾ] when it is preceded by a sonorant phoneme other than an alveolar nasal or lateral, and, at the same time, followed by an unstressed vowel phoneme.

/t/ → [ɾ] | /+son −lat/ _ /+vwl −str/

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